Assassination Classroom
So Karma and Gakushuu do self-harm.
Of course, they're depressed in their own little ways.
One day, Karma is scrolling through his phone when he sees this thing online.
A person, formerly a person who inflicted harm on their own self, has talked about their struggle to stop self-harming.
Karma learns that when you feel like hurting yourself, you can use markers and pens instead.
So he does just that.
He takes a little marker and scribble random swirls into his arm and-
And it's nice.
It's nicer than he expected.
So Karma finds that he likes this new idea, so he starts bringing markers and pens everywhere with him.
He draws in class, during lunch, whenever.
He's been drawing so much he's actually gotten good at it.
Then Gakushuu goes what are you doing and Karma explains.
Then Gakushuu starts doing the same.
Asdfghjkl and then when drawing on themselves is not enough, they start drawing on each other.
When Karma hangs out with 3-E, he draws on them, and he never explains why, so they're left in complete confusion.
Then The Virtuosos find them drawing on each other and they're like what are you two doing? and Karma's like we're drawing and The Virtuosos are like on each other?! and Karma goes yeah.
Then The Virtuosos find out why and when and then they start letting the two sadistic evil geniuses draw on them too and it's so precious and there's so much fluff and ugh.
Gakuhou somehow finds out and he's concerned but is bad at feelings and parenting so he's just creeping around the corners of the house and watching Gakushuu and spouting out stuff he found on the internet about depressed people like do you need antidepressants or I heard about this blah blah blah and it's good and healthy for those who crave death to blah blah blah and Gakushuu's like father, sir, stop.
Gakuhou also watches over Karma in his own little way. Karma receives new markers and pens and also other assortments of items. He always finds them on his doorstep.
Then Karma comes over for a sleepover because his parents are home and he doesn't want to see them.
So he sleeps in Gakushuu's room on the bed because they aren't letting him sleep on the floor and at some point he and Gakushuu end up cuddling. (Can be viewed as romantic or platonic)
It's adorable as fuck and Gakuhou takes a fuck ton of pictures.
Then Karma goes back home and his parents haven't noticed a thing wrong because of course they don't.
But in the end the idea/fic/whatever ends in a really cute/really fluffy way asdfghjkl